At the end of printed page 39 and the beginning of page 40, the text considers an additional proposed condition:
وَمِنَ الْكَرَاهَةِ فِي السَّمْعِ
And freedom from what is displeasing to the ear.
On this proposal, even if the three established defects are absent, unpleasantness to a listener would be evaluated separately.
The discussion mentions words such as al-jursha, takaʾkaʾtum, and ifranqaʿu. The commentary challenges the proposed explanation. Not every negative aesthetic reaction obviously amounts to a separate, independent linguistic defect.
The core framework remains the three defects: phonetic disharmony, obscurity, and deviation from attested linguistic form. Mere unpleasantness to a listener is an additional and contested proposal.